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Fencer Intel
medium 5.0

CVE-2012-3544 json

Apache Tomcat Vulnerable to Denial of Service (DoS) via Improper Handling of chunk extensions

published 2013-06-01 13 y ago modified 2026-10-09 30 d ago also GHSA-qfxv-3ppc-7qg5 , EUVD-2012-3492

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
11.0%
EPSS 11.0% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

Apache Tomcat 6.x before 6.0.37 and 7.x before 7.0.30 does not properly handle chunk extensions in chunked transfer coding, which allows remote attackers to cause a denial of service by streaming data.

Patch / fix

  • maven org.apache.tomcat:tomcat 6.0.37, 7.0.30
  • ecj3 jboss enterprise web server 2 1:3.7.2-6.redhat_1.ep6.el6
  • dom4j jboss enterprise web server 2 1.6.1-19.redhat_5.ep6.el6
  • httpd jboss enterprise web server 2 2.2.22-23.ep6.el6
  • mod_jk jboss enterprise web server 2 1.2.37-2.redhat_1.ep6.el6
  • mod_ssl jboss enterprise web server 2 1:2.2.22-23.ep6.el6
  • tomcat6 jboss enterprise web server 2 6.0.37-10_patch_01.ep6.el6
  • tomcat7 jboss enterprise web server 2 7.0.40-5_patch_01.ep6.el6
  • httpd-tools jboss enterprise web server 2 2.2.22-23.ep6.el6

red hat advisories RHSA-2013:1012RHSA-2013:1011

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2012-3544 updated cvss 4.3

tomcat: Limited DoS in chunked transfer encoding input filter

  • Red Hat JBoss Enterprise Web Server 1 tomcat6
    affected: no fix planned “Will not fix”
  • Red Hat JBoss Enterprise Web Server 2 for RHEL 5 Server httpd 2.2.22-23.ep6.el5, mod_ssl 2.2.22-23.ep6.el5, ecj3 3.7.2-6.redhat_1.ep6.el5, httpd-tools 2.2.22-23.ep6.el5, httpd-manual 2.2.22-23.ep6.el5, dom4j 1.6.1-19.redhat_5.ep6.el5, +33 more
    fixed: vendor fix RHSA-2013:1011
  • Red Hat JBoss Enterprise Web Server 2 for RHEL 6 Server httpd 2.2.22-23.ep6.el6, mod_ssl 2.2.22-23.ep6.el6, ecj3 3.7.2-6.redhat_1.ep6.el6, httpd-tools 2.2.22-23.ep6.el6, httpd-manual 2.2.22-23.ep6.el6, dom4j 1.6.1-19.redhat_5.ep6.el6, +33 more
    fixed: vendor fix RHSA-2013:1012
  • Red Hat JBoss Web Server 2.0
    fixed: vendor fix RHSA-2013:1013
  • Red Hat Enterprise Linux 5 tomcat5 Red Hat Enterprise Linux 6 tomcat6, tomcat6-lib, tomcat6-log4j, tomcat6-javadoc, tomcat6-webapps, tomcat6-el-2.1-api, +4 more Red Hat JBoss Enterprise Application Platform 6 jbossweb jbossweb Red Hat JBoss Enterprise Web Server 1 tomcat5 tomcat5
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
31 d ago

Exploit prediction

11.00% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected packages

ecosystem package affected fixed in
maven org.apache.tomcat:tomcat
>=6.0.0, <6.0.37
>=7.0.0, <7.0.30
6.0.37
7.0.30

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.